support @base/object module

[PPpro]

this should be done before the task #16372

and it's a sub task of #14293

[minggo]

Why make object itself be a separate module? Can't it be part of base module?

[PPpro]

Why make object itself be a separate module? Can't it be part of base module?

as it's duscussed before #16247 (comment), base should be a layer, and object should be a module in base layer

of course we can merge the total base layer as a full module in the future, but not now